natural radiation source
as defined in Council Directive 2013/59/Euratom of 5 December 2013 laying down basic safety…, Article 4, point (54) (Definitions)
a source of ionising radiation of natural, terrestrial or cosmic origin
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Also defined in
- Proposal for a COUNCIL DIRECTIVE laying down basic safety standards for protection against the dangers arising from… 52011PC0593, Article 4, point (65)
sources of ionising radiation of natural terrestrial or cosmic origin